/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.view;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;

import com.google.zxing.ResultPoint;
import com.jinlin.zxing.R;
import com.google.zxing.camera.CameraManager;

import java.util.Collection;
import java.util.HashSet;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder
 * rectangle and partial transparency outside it, as well as the laser scanner
 * animation and result points.
 */
public final class ViewfinderView extends View {

	private static final int[] SCANNER_ALPHA = { 0, 64, 128, 192, 255, 192,
			128, 64 };
	private static final long ANIMATION_DELAY = 30L;
	private static final int OPAQUE = 0xFF;

	private final Paint paint;
	private Bitmap resultBitmap;
	private Bitmap tipBitmap;
	private final int maskColor;
	private final int resultColor;
	private final int frameColor;
	private final int laserColor;
	private final int resultPointColor;
	private int scannerAlpha;
	private Collection<ResultPoint> possibleResultPoints;
	private Collection<ResultPoint> lastPossibleResultPoints;
	private int oneDip = 0;
	private String tip_string = null;

	// This constructor is used when the class is built from an XML resource.
	public ViewfinderView(Context context, AttributeSet attrs) {
		super(context, attrs);

		// Initialize these once for performance rather than calling them every
		// time in onDraw().
		paint = new Paint();
		Resources resources = getResources();
		maskColor = resources.getColor(R.color.viewfinder_mask);
		resultColor = resources.getColor(R.color.result_view);
		frameColor = resources.getColor(R.color.viewfinder_frame);
		laserColor = resources.getColor(R.color.viewfinder_laser);
		resultPointColor = resources.getColor(R.color.possible_result_points);
		tipBitmap = BitmapFactory.decodeResource(resources,
				R.mipmap.btn_header_barcode);
		oneDip = 1;
		tip_string = resources.getString(R.string.capture_tips);
		scannerAlpha = 0;
		possibleResultPoints = new HashSet<>(5);
	}

	int middle = 0;
	private Rect srcRact;
	private Rect dstRect;
	@Override
	public void onDraw(Canvas canvas) {
		Rect frame = CameraManager.get().getFramingRect();
		if (frame == null) {
			return;
		}
		int width = canvas.getWidth();
		int height = canvas.getHeight();

		// Draw the exterior (i.e. outside the framing rect) darkened
		paint.setColor(resultBitmap != null ? resultColor : maskColor);
		canvas.drawRect(0, 0, width, frame.top, paint);
		canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
		canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,
				paint);
		canvas.drawRect(0, frame.bottom + 1, width, height, paint);

		if (resultBitmap != null) {
			// Draw the opaque result bitmap over the scanning rectangle
			paint.setAlpha(OPAQUE);
			canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
		} else {

			// Draw a two pixel solid black border inside the framing rect
			paint.setColor(frameColor);
			canvas.drawRect(frame.left, frame.top, frame.right + 1,
					frame.top + 2, paint);
			canvas.drawRect(frame.left, frame.top + 2, frame.left + 2,
					frame.bottom - 1, paint);
			canvas.drawRect(frame.right - 1, frame.top, frame.right + 1,
					frame.bottom - 1, paint);
			canvas.drawRect(frame.left, frame.bottom - 1, frame.right + 1,
					frame.bottom + 1, paint);

			//Draw the corner
			paint.setColor(laserColor);
			int cornerLength = 30;
			int cornerWidth = 6;
			
			//左上角
			canvas.drawRect(frame.left + 2, frame.top+2,frame.left+2+cornerLength+cornerWidth,
					frame.top+2+cornerWidth, paint);
			canvas.drawRect(frame.left + 2, frame.top+2+cornerWidth,frame.left+2+cornerWidth,
					frame.top+2+cornerWidth+cornerLength, paint);//竖
			//左下角
			canvas.drawRect(frame.left + 2, frame.bottom-1-cornerWidth,frame.left+2+cornerLength+cornerWidth,
					frame.bottom-1, paint);//横
			canvas.drawRect(frame.left + 2, frame.bottom-1-cornerWidth-cornerLength,frame.left+2+cornerWidth,
					frame.bottom-1-cornerWidth, paint);
			
			//右上角
			canvas.drawRect(frame.right - 1-cornerWidth, frame.top+2+cornerWidth,frame.right-1,
					frame.top+2+cornerWidth+cornerLength, paint);		//竖
			canvas.drawRect(frame.right - 1 -cornerLength-cornerWidth, frame.top+2,frame.right-1,
					frame.top+2+cornerWidth, paint);
			//右下角
			canvas.drawRect(frame.right - 1-cornerWidth, frame.bottom-1-cornerLength-cornerWidth,frame.right-1,
					frame.bottom-1, paint);		//竖
			canvas.drawRect(frame.right - 1 -cornerWidth-cornerLength, frame.bottom-1-cornerWidth,frame.right-1-cornerWidth,
					frame.bottom-1, paint);
			// Draw a red "laser scanner" line through the middle to show
			// decoding is active
			paint.setColor(laserColor);
			paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
			scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
//			 = frame.height() / 2 + frame.top;
			if(middle>frame.bottom-2||middle<frame.top){
				middle = frame.top+2;
			}else{
				middle+=5;
			}
			canvas.drawRect(frame.left + 2 + cornerWidth, middle - 2, frame.right - 1 - cornerWidth,
					middle + 2, paint);

			Collection<ResultPoint> currentPossible = possibleResultPoints;
			Collection<ResultPoint> currentLast = lastPossibleResultPoints;
			if (currentPossible.isEmpty()) {
				lastPossibleResultPoints = null;
			} else {
				possibleResultPoints = new HashSet<>(5);
				lastPossibleResultPoints = currentPossible;
				paint.setAlpha(OPAQUE);
				paint.setColor(resultPointColor);
				for (ResultPoint point : currentPossible) {
					canvas.drawCircle(frame.left + point.getX(), frame.top
							+ point.getY(), 6.0f, paint);
				}
			}
			if (currentLast != null) {
				paint.setAlpha(OPAQUE / 2);
				paint.setColor(resultPointColor);
				for (ResultPoint point : currentLast) {
					canvas.drawCircle(frame.left + point.getX(), frame.top
							+ point.getY(), 3.0f, paint);
				}
			}

			if (tipBitmap != null && !TextUtils.isEmpty(tip_string)) {
				if(srcRact == null){
					srcRact = new Rect();
				}
				srcRact.left = 0;
				srcRact.right = 0;
				srcRact.right = tipBitmap.getWidth();
				srcRact.bottom = tipBitmap.getHeight();
				
				int dstBitmapSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, getResources().getDisplayMetrics());
				int dstRectLeft =  width/5;
				int dstRectTop = frame.bottom + (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics())* oneDip;
				
				if(dstRect == null){
					dstRect = new Rect();
				}
				
				dstRect.left = dstRectLeft;
				dstRect.top = dstRectTop;
				dstRect.right = dstRectLeft + dstBitmapSize;
				dstRect.bottom = dstRectTop + dstBitmapSize;
				
				canvas.drawBitmap(tipBitmap, srcRact,dstRect, paint);
				paint.setColor(Color.parseColor("#80ffffff"));
				paint.setTextSize(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
				int left = dstRectLeft + dstBitmapSize + (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 5, getResources().getDisplayMetrics()) * oneDip;
				int top = (int) (frame.bottom + (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics())* oneDip
						+ paint.getTextSize());
				canvas.drawText(tip_string, left, top, paint);
				paint.setColor(resultColor);
			}

			// Request another update at the animation interval, but only
			// repaint the laser line,
			// not the entire viewfinder mask.
			postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,
					frame.right, frame.bottom);
		}
	}

	public void drawViewfinder() {
		resultBitmap = null;
		invalidate();
	}

	/**
	 * Draw a bitmap with the result points highlighted instead of the live
	 * scanning display.
	 * 
	 * @param barcode
	 *            An image of the decoded barcode.
	 */
	public void drawResultBitmap(Bitmap barcode) {
		resultBitmap = barcode;
		invalidate();
	}

	public void addPossibleResultPoint(ResultPoint point) {
		possibleResultPoints.add(point);
	}

}
